New Hampshire Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Sodium lauryl sulfate is a commonly used surfactant in shampoos known for its ability to create a rich lather and effectively remove dirt and oil from the hair. However, it is also known for its potential to strip the hair and scalp of natural oils, which can lead to dryness. The aggressive cleansing action of sodium lauryl sulfate can disrupt the moisture balance of the hair, making it feel brittle and dehydrated, especially for individuals with sensitive scalps or particularly dry hair types.

In contrast, coconut oil is often recognized for its moisturizing properties, helping to prevent dryness by nourishing the hair. Glycerin is a humectant, attracting moisture to the hair, while silicone is used to provide a protective coating, adding shine and smoothness without usually causing dryness. Each of these ingredients serves a different function, highlighting the drying effect that sodium lauryl sulfate can have when included in shampoo formulations.